themusicman500: On the subject of whether the relationship in this story is being depicted positively or not, I'd say no, but with a caveat. The author is presenting an obviously disgusting and awful thing, but leaving open the question of whether there's some beauty to be found in it too despite the awfulness. It's a theme that Gen Urobochi explores a lot in his works.
You put it far better than I ever could have; thank you.
I wrote earlier about how I feel that, whether or not Jinno likes the relationship, that it's not a healthy relationship for either Jinno or Kousaka... But, at the same time, it is obvious that the relationship brings happiness - albeit unhealthy happiness - to both of them. This emphatically does not make it an okay or a good thing, but, like you said, even in a twisted situation like this, there's still some "beauty to be found in it too".
Is Kousaka preying on Jinno okay? No.
Does Kousaka preying on Jinno make Jinno happy? Yes.
Does the fact that this makes Jinno happy make Kousaka's predation okay? No.
Imagine that, a work of artistic fiction that's nuanced and complex. I guess that's too much for a lot of people, though, who would rather prefer some sort of black and white, simple plot to follow... >_>
Last two cents: I think portraying it "as is" rather than hamfistedly trying to emphasize any sort of awfulness on Kousaka's part is more effective than the latter, since it allows the readers themselves to draw their own conclusions about the relationship between Kousaka and Jinno, which is - in my opinion - a far more powerful thing than delivering a pre-developed conclusion from the get-go.